package tui

import (
	"fmt"
	"slices"
	"strings"
	"testing"

	tea "github.com/charmbracelet/bubbletea"

	"proxyctl/internal/app"
	"proxyctl/internal/profile"
)

// profileManagementModule is an in-memory Application seam used to drive the
// same complete Model as production while making CRUD results observable.
type profileManagementModule struct {
	snapshot      app.Snapshot
	intents       []app.Intent
	reverseUpdate bool
}

func (m *profileManagementModule) Snapshot() app.Snapshot { return m.snapshot }

func (m *profileManagementModule) Dispatch(intent app.Intent) app.Result {
	m.intents = append(m.intents, intent)
	switch intent.Kind {
	case app.CreateProfile:
		m.snapshot.Profiles = append(m.snapshot.Profiles, intent.Profile)
	case app.UpdateProfile:
		for i := range m.snapshot.Profiles {
			if m.snapshot.Profiles[i].Name == intent.Name {
				m.snapshot.Profiles[i] = intent.Profile
				break
			}
		}
		if m.snapshot.ActiveProfile == intent.Name {
			m.snapshot.ActiveProfile = intent.Profile.Name
		}
		if m.reverseUpdate {
			slices.Reverse(m.snapshot.Profiles)
		}
	case app.DeleteProfile:
		for i := range m.snapshot.Profiles {
			if m.snapshot.Profiles[i].Name == intent.Name {
				m.snapshot.Profiles = append(m.snapshot.Profiles[:i], m.snapshot.Profiles[i+1:]...)
				break
			}
		}
		if m.snapshot.ActiveProfile == intent.Name {
			m.snapshot.ActiveProfile = ""
		}
	}
	return app.Result{Snapshot: m.snapshot, Notice: "done"}
}

func (m *profileManagementModule) StartOperation(intent app.Intent) app.OperationStream {
	result := m.Dispatch(intent)
	updates := make(chan app.OperationUpdate, 1)
	updates <- app.SucceededOperationUpdate(result.Snapshot, app.OperationStatus{Summary: result.Notice}, nil)
	close(updates)
	return app.OperationStream{Snapshot: result.Snapshot, Updates: updates}
}

func TestCompleteModelProfileManagementScrollsAndReviewsObscuredDetailsAcrossResize(t *testing.T) {
	profiles := make([]profile.Profile, 30)
	for i := range profiles {
		profiles[i] = profile.Profile{
			Name:      fmt.Sprintf("site-%02d", i),
			Mode:      profile.SingleMode,
			SingleURL: fmt.Sprintf("https://operator:secret-%02d@proxy-%02d.example:8443", i, i),
			Bypass:    []string{fmt.Sprintf("internal-%02d.example", i), "localhost"},
		}
	}
	module := &profileManagementModule{snapshot: app.Snapshot{ActiveProfile: "site-00", Profiles: profiles}}
	model := resizedModel(t, module, themeModeNoColor, 80, 24)
	model = updateKey(model, "m")
	for range 24 {
		model = updateKey(model, "down")
	}

	for _, size := range []struct{ width, height int }{{80, 24}, {120, 36}, {60, 16}, {80, 24}} {
		model = resize(model, size.width, size.height)
		view := model.View()
		assertUsableFrame(t, view, size.width, size.height,
			">   site-24", "Mode: single", "https://operator:REDACTED@proxy-24.example:8443", "internal-24.example")
		if strings.Contains(view, "secret-24") {
			t.Fatalf("Profile details exposed credentials after resize to %dx%d:\n%s", size.width, size.height, view)
		}
		if size.width == 60 && size.height == 16 {
			model = updateKey(model, "pgdown")
			assertUsableFrame(t, model.View(), 60, 16, "localhost")
			model = updateKey(model, "pgup")
		}
	}
}

func TestCompleteModelProfileManagementHasCreateAndEditEntryPointsButNoActivationAction(t *testing.T) {
	module := &profileManagementModule{snapshot: app.Snapshot{Profiles: []profile.Profile{{
		Name: "office", Mode: profile.SingleMode, SingleURL: "http://proxy.example:8080",
	}}}}
	model := resizedModel(t, module, themeModeNoColor, 80, 24)
	model = updateKey(model, "m")
	view := model.View()
	assertUsableFrame(t, view, 80, 24, "n: create", "e: edit", "d: delete", "q/Esc: back")
	if strings.Contains(view, "activate") {
		t.Fatalf("management page mixed in Active Profile switching:\n%s", view)
	}

	model = updateKey(model, "n")
	if view := model.View(); !strings.Contains(view, "Create Proxy Profile") {
		t.Fatalf("create entry point did not open the existing editor:\n%s", view)
	}
	model = updateKey(model, "esc")
	model = updateKey(model, "e")
	if view := model.View(); !strings.Contains(view, "Edit Proxy Profile") || !strings.Contains(view, "office") {
		t.Fatalf("edit entry point did not open the existing editor:\n%s", view)
	}
}

func TestCompleteModelProfileDeletionDialogIsSafeByDefaultAndSupportsExplicitSelection(t *testing.T) {
	module := &profileManagementModule{snapshot: app.Snapshot{Profiles: []profile.Profile{{
		Name: "office", Mode: profile.SingleMode, SingleURL: "http://proxy.example:8080",
	}, {
		Name: "remote", Mode: profile.SingleMode, SingleURL: "http://remote.example:8080",
	}}}}
	model := resizedModel(t, module, themeModeNoColor, 80, 24)
	model = updateKey(model, "m")
	model = updateKey(model, "d")
	view := model.View()
	assertUsableFrame(t, view, 80, 24, "Delete Proxy Profile “office”?", "> Cancel", "Delete", "Enter: choose")

	updated, command := model.Update(tea.KeyMsg{Type: tea.KeyEnter})
	model = updated.(Model)
	if command != nil || len(module.intents) != 0 || strings.Contains(model.View(), "Delete Proxy Profile “office”?") {
		t.Fatalf("safe-default Enter did not cancel deletion: intents=%#v\n%s", module.intents, model.View())
	}

	model = updateKey(model, "d")
	model = updateKey(model, "q")
	if len(module.intents) != 0 || strings.Contains(model.View(), "Delete Proxy Profile “office”?") {
		t.Fatalf("q did not cancel deletion without mutation: intents=%#v\n%s", module.intents, model.View())
	}

	model = updateKey(model, "d")
	model = updateKey(model, "right")
	updated, command = model.Update(tea.KeyMsg{Type: tea.KeyEnter})
	model = updated.(Model)
	if command != nil || len(module.intents) != 1 || module.intents[0].Kind != app.DeleteProfile || module.intents[0].Name != "office" || !module.intents[0].Confirm {
		t.Fatalf("focused Delete did not dispatch the confirmed mutation: intents=%#v", module.intents)
	}
	assertUsableFrame(t, model.View(), 80, 24, ">   remote", "Proxy: http://remote.example:8080")
}

func TestCompleteModelFinalProfileDeletionExplainsDriftAndRequiresExplicitConfirmation(t *testing.T) {
	module := &profileManagementModule{snapshot: app.Snapshot{ActiveProfile: "office", Profiles: []profile.Profile{{
		Name: "office", Mode: profile.SingleMode, SingleURL: "http://proxy.example:8080",
	}}}}
	model := resizedModel(t, module, themeModeNoColor, 80, 24)
	model = updateKey(model, "m")
	model = updateKey(model, "d")
	model = resize(model, 60, 16)
	view := model.View()
	assertUsableFrame(t, view, 60, 16,
		"final Proxy Profile", "managed configuration remains", "become Drifted", "> Cancel")

	model = updateKey(model, "y")
	if len(module.intents) != 1 || module.intents[0].Kind != app.DeleteProfile || module.intents[0].Name != "office" || !module.intents[0].Confirm {
		t.Fatalf("explicit confirmation dispatched %#v", module.intents)
	}
	model = resize(model, 80, 24)
	view = model.View()
	assertUsableFrame(t, view, 80, 24, "No Proxy Profiles saved.", "Press n to create one.")
	if strings.Contains(view, "No Active Profile") {
		t.Fatalf("management empty state conflated saved Profiles with Active Profile state:\n%s", view)
	}
}

func TestCompleteModelProfileSelectionUsesIdentityAcrossResizeAndReorderedCRUDResult(t *testing.T) {
	profiles := make([]profile.Profile, 22)
	for i := range profiles {
		profiles[i] = profile.Profile{Name: fmt.Sprintf("profile-%02d", i), Mode: profile.SingleMode, SingleURL: fmt.Sprintf("http://proxy-%02d.example:8080", i)}
	}
	module := &profileManagementModule{snapshot: app.Snapshot{Profiles: profiles}, reverseUpdate: true}
	model := resizedModel(t, module, themeModeNoColor, 80, 24)
	model = updateKey(model, "m")
	for range 17 {
		model = updateKey(model, "down")
	}
	model = resize(model, 120, 36)
	model = resize(model, 60, 16)
	model = updateKey(model, "e")
	model = updateKey(model, "ctrl+s")

	view := model.View()
	assertUsableFrame(t, view, 60, 16, ">   profile-17", "Proxy: http://proxy-17.example:8080")
	if len(module.intents) != 1 || module.intents[0].Kind != app.UpdateProfile || module.intents[0].Name != "profile-17" {
		t.Fatalf("edit dispatched %#v", module.intents)
	}
}

func TestCompleteModelProfileManagementDoesNotConflateSavedAndActiveProfileState(t *testing.T) {
	module := &profileManagementModule{snapshot: app.Snapshot{Profiles: []profile.Profile{{
		Name: "available", Mode: profile.SingleMode, SingleURL: "http://proxy.example:8080",
	}}}}
	model := resizedModel(t, module, themeModeNoColor, 80, 24)
	model = updateKey(model, "m")
	view := model.View()
	assertUsableFrame(t, view, 80, 24, ">   available", "Selected Profile")
	if strings.Contains(view, "No Active Profile") || strings.Contains(view, "No Proxy Profiles") {
		t.Fatalf("management page misreported a non-active saved Profile as empty:\n%s", view)
	}
}

func TestCompleteModelProfileManagementNavigationAndBusyReasonsAreConsistent(t *testing.T) {
	module := &profileManagementModule{snapshot: app.Snapshot{Profiles: []profile.Profile{{Name: "office"}}}}
	for _, back := range []tea.KeyMsg{{Type: tea.KeyEsc}, {Type: tea.KeyRunes, Runes: []rune{'q'}}} {
		model := resizedModel(t, module, themeModeNoColor, 80, 24)
		model = updateKey(model, "m")
		updated, command := model.Update(back)
		model = updated.(Model)
		if command != nil || !strings.Contains(model.View(), "Operations Console") {
			t.Fatalf("%q did not return to the dashboard:\n%s", back.String(), model.View())
		}
	}

	model := resizedModel(t, module, themeModeNoColor, 80, 24)
	model = updateKey(model, "m")
	updated, command := model.Update(tea.KeyMsg{Type: tea.KeyCtrlC})
	if command == nil {
		t.Fatal("Ctrl+C on Profile management did not follow the global exit contract")
	}
	if _, ok := command().(tea.QuitMsg); !ok {
		t.Fatal("Ctrl+C on Profile management did not emit tea.Quit")
	}
	_ = updated

	checking := &profileManagementModule{snapshot: app.Snapshot{
		Profiles: []profile.Profile{{Name: "office"}},
		Targets:  []app.TargetSnapshot{{ID: "shell", DetectionPhase: app.TargetChecking}},
	}}
	busy := resizedModel(t, checking, themeModeNoColor, 80, 24)
	busy = updateKey(busy, "m")
	if view := busy.View(); !strings.Contains(view, "Profile management disabled: wait for the current mutation to finish") {
		t.Fatalf("disabled Profile management action did not expose its reason:\n%s", view)
	}
}